Due to my recent comment spam issues I've created a new PyBlosxom plugin called spamquestion. It is similar to the existing Magic Word plugin but instead of using just the one question for any comment entry on the blog, it randomly selects a question from a larger set of configured questions. This makes it much harder for spammers to get past the comment form using automated software. Unlike CAPTCHA systems this scheme doesn't disadvantage visually impaired people or those on text based browsers.
The spamquestion plugin can be downloaded from my Code page.
Comments are now re-enabled on my site, with spamquestion enabled. It'll be interesting to see how the scheme holds up. I also plan to install the Akismet plugin as a second line of defense.